| FTIR | Fourier-transformed infrared; functional terminal innervation ratio |
|---|---|
| IF | idiopathic fibroplasia; idiopathic flushing; immersion foot; immunofluorescence; indirect fluorescen... |
| IFR | infrared; inspiratory flow rate |
| ILS | idiopathic leucine sensitivity; idiopathic lymphadenopathy syndrome; increase in life span; infrared... |
| IR | drop of voltage across a resistor produced by a current; ileal resection; immune response; immunizat... |